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DAM-134 A one-fourth scale model of an airplane is to be tested in water. The ai...
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DAM-134 A one-fourth scale model of an airplane is to be tested in water. The airplane has a velocity of 700 km/h in air at -50 degree-C. The water temperature in the test section is 10 degree-C. In order to achieve similarity between the model and the prototype, the test is done at a water velocity of 393 km/h. If the average drag force on the model is measured to be 13,800 N, the drag force on the prototype is (The properties of air at 1 atm and -50 degree-C: rho = 1.582 kg/m^3, mu = 1.474x10^-5 kg/m.s ; The properties of water at 1 atm and 10 degree-C: rho = 999.7 kg/m^3, mu = 1.307x10^-3 kg/m.s)
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